Mayor de Blasio promises to “do more” to clear drivers from bus lanes and to build more protected bike lanes, but stopped short of endorsing a bold (and expensive) initiative from the City Council’s transportation chief to create an entirely new police unit to enforce surface transit scofflaws and quadruple the mileage of safe routes for cyclists.

Council Member Ydanis Rodriguez called for the new bus lane enforcement unit on Tuesday, following up on his call last week for 100 miles of new protected bike lanes every year, but Hizzoner batted both proposals aside gently.

“On the question of enforcement, I’ve said very publicly, we intend to do more and we need to do more on bus lane enforcement,” he said on Tuesday afternoon. Pressed about building 100 miles of protected bike lanes — up from an average of about 25 per year, and growing slightly — the mayor defended his prior work.